A: Because redidt is built upon HTML. HTML does not allow you to directly control the white space of your post. By white space I mean using more than one space in a row to try to separate your text, or pressing RETURN more than 2 times in a row to put some white space between what you just typed and what you are about to type. In fact, even to begin typing on a new line, rather than continue typing on the existing line, you must include 2 spaces at the end of your text before pressing RETURN. To begin a new line with some space between it and the previous line, press RETURN twice. Once you have tried adding various combinations of contiguous spaces and/or RETURNs into your posts you'll get the hang of it.

Q: How do I make my text bold?A: Begin the text you want to bold by keying in two asterisks, "*". Then type your text immediately after, without any spaces intervening. At the end of your text, again without any intervening spaces, type two asterisks.

Q: How do I add one or more indented bullet points to my text?A: Begin the text you want to to place in an indented bullet point by typing one asterisk followed by one space. At the end of the bullet point, press RETURN twice. For additional bullet points, begin each with an asterisk followed by a space followed by your text.

Q: How do I add an indented numbered list to my text?A: Begin the text you want to place in an indented number list with a digit followed by a period followed by a space followed by the text. This number, period, space must be the first characters on a line.

Q: How do I create that indented text that's displayed in a different font that I see on other subreddits?A: Begin each line of text you want to appear indented and in a different font with four contiguous spaces.

Q: How do I include a quote from another redditor in my post?

A: Begin each line of text you want to quote with a right angle bracket, ">" followed by a space then your text. Make sure you add a blank line (2 RETURNs) above and below the text you are quoting.

Q: How do I add a hyperlink to my text?A: Enclose the text you want to be highlighted on the page as the link in a beginning square bracket, "[" and an ending square bracket, "]", with no intervening spaces. Then, with no intervening spaces, type in the URL as you copied it from your browser, and surround it with parentheses. The link will appear in your text with whatever attributes are assigned it by its css style sheet; typically blue text.

Q: How do I enter those cool characters I see on other reddits?A: They are called UNICODE characters, and your hardware, operating system and browser are almost sure to support them. To 'type' them into your text you can type them one character at a time. Each character is typed by depressing and holding the "alt" key, typing one or more digits (these digits must be typed using the Number Pad) and then releasing the alt key. The unicode character displayed will be the one defined by this string of digits. Or you can simply copy and paste from another source, e.g. ŤĦ£®£§ ÑØ §£ç®£Ť ĴŲ§Ť Ų§£ ŤĦ£ɱ ɭɪʞ£ Ť£χŤ; kindly generated for me by noted /r/csshelp redditor MCprofK Here's some cool examples,

Q: How do I get text to pop up when I place my cursor over a link?A: When you define your link as above, instead of only putting the destination URL inside parentheses, add a space after the URL, then a double quote, ("), then the text you want to pop up when your cursor hovers over the link, then the closing double quote.

Q: What is a spoiler?A: Reddit slang for a snippet of text that looks like a link but isn't. If a reader clicks it, they are taken to a reddit 'page not found'. When a reader's cursor hovers above this spoiler, some text pops up leading the reader to believe the popped up text hints at what's to come if the reader clicks the link, only to have it spoiled when the reader is sent to the not found page. See example at top of this post, the little pic of a dude wearing a headset.

Q: What controls the display of my subreddit pages?A: The display of the pages on a particular subreddt is controlled by the text the you type into your post (most of this is just the text that gets displayed, and some are reddit specific commands like bold above), and the HTML and associated CSS style sheets used by the reddit.com servers to 'serve up' and display the web pages.

Q: How can I modify the way reddit displays my subreddit's web pages?A: Reddit.com provides an interface where the subreddit's moderator, who has special permissions which allow them to modify stuff, can add commands to the style sheet used to display the page. To access this interface, go to the subreddit. Add this text "/about/stylesheet" to the end of the URL and press enter. A page will be displayed where you may add commands to the style sheet.

Q: How can I control the color of the text used in postings, mine and others, in my subreddit?A: As an example, add the following to your style sheet:

Then, in your posts, do this:
Type in the left square bracket "["
Then type in your text followed by the right square bracket "]"
Then, without any intervening spaces, type in the left parenthesis"(", the hash/pound sign "#", the word "green", and finally, the right parenthesis")"

There are many colors you can use (see color pallet) though you'll have to come up with a unique name for each one when using the above method. Each color requires it's own declaration/definition in the style sheet. Using the above example, change the name of the color, and the definition, i.e. the 6 hexadecimal characters after "color:#". E.G.

.usertext .md a[href$="#red"] {color:#ff0000;cursor:default}

And about the text "cursor:default" used in the above examples. Explaining this will require some history. Notice in the above example, .usertext, then .md then a[...] etc. The "a" defines an 'anchor' which, in the early days of HTML and the web, was a method of entering hypertext links in a text. The text typed between the square brackets was highlighted on the page in blue, and if one clicked on it, they would be taken to the URL that was defined immediately following the 'closing', or right angle bracket. In reddit.com, by utilizing the 'a' command, one invokes reddit's default style sheet and creates a hyperlink in the page. If all you want to do is change the color of the text, you need to account for this default behavior of reddit's, and tell reddit not to cause the cursor to act as if it's hovering over a link; i.e. don't display the 'link' when you hover, display nothing, just make the text green, and don't do anything if the colored text is clicked on.

Q: How do I put a hyperlink in my post linking to an arbitrary point in the text of the post?A: It is not possible unless the post in question is a reddit wiki.

Q: How can I get a particular, arbitrary post to stay at the top of the listing of the posts in my subreddit?A: Navigate to your subreddit and select the post you want to stay at the top by clicking on it. On its webpage you will find three sections.

The top section which displays the post's title and body

The middle section where new comments can be posted as replies to the original post (the OP)

Q: What does the word "flair" mean in the reddit community?A: Whenever a redditor either Submits a post, or Comments on a submission, or Replies to a comment, reddit automatically includes information about the post and the poster, e.g. the posting redditor's username as a signature. The default for displaying this username is a simple text string.

In some cases, something graphical can be added to a username, and this graphic will display along with the text string. This graphic is called a "FLAIR". (Possibly because it adds some flair to a signature.)

To 'type' them into your text you can type them one character at a time. Each character is typed by depressing and holding the "alt" key, typing one or more digits (these digits must be typed using the Number Pad) and then releasing the alt key.

I do not know. I have received a lot of help from the sub /r/csshelp. In fact, they have answered every question I posted. I believe if you post this question there you will quickly get a great answer.